Khao San may be a little hardcore, or basic, for those who are no longer backpackers I think?
If you are looking for some action for your night in Bangkok, try the Nana Hotel. Nana Plaza across the road and Angels Disco out back, 20mins in a cab from the airport.
If you need a little peace, and if I have someone meeting me at the airport this is what I do, before you clear arrivals in the airport there are some places touting hotels, tell them what you want and they will sort you out. They will sort your transport into Bangkok for around 500baht as well.
